About the Author
John Walkenbach is a bestselling Excel author who has published more than 50 spreadsheet
books. He lives amid the saguaros, javelinas, rattlesnakes, bobcats, and gila monsters in Southern
Arizona — but the critters are mostly scared away by his clawhammer banjo playing. For more
information, Google him.01_474877-ffirs.indd vii01_474877-ffirs.indd vii 3/29/10 11:34 PM3/29/10 11:34 PM